[rancid] eliminating noise

[Robert Drake]

What you need is a network monitoring system that supports thresholds.  
The problem with doing this with rancid is that you probably don't run 
it often enough to see changes when they happen, and you don't know that 
when you run it you'll be at an outlying temperature.

Say run #1 happens at 6:00pm and the temperature is 25C, run #2 happens 
at 8:00pm and the temperature is 35C.  That's perfect, but what happens 
if there is an incremental climb through the afternoon and you get 28C, 
then 32C, then 35C?


On 11/19/2014 11:48 PM, Peter Jackson wrote:
> Frank,
>
> I believe Wayne would like to keep the command output but only record 
> a change if the variable differs by a set amount.
>
> So in Wayne's example we want RANCID to record a different temperature 
> only if it was 10 degrees higher or lower than the last RANCID run.
>
> You wouldn't see this diff:
>
> - ! External Temperature............................. +25 C
>
> + ! External Temperature............................. +30 C
>
>
> But you would see this one:
>
> - ! External Temperature............................. +25 C
>
> + ! External Temperature............................. +35 C
>
>
> We have removed a lot of command output for just this reason - because 
> it sends too many diffs to be useful.  But having something like what 
> Wayne suggests would be really nice and we would be able to add those 
> commands back to RANCID without getting all of the insignificant diffs.
>
> Peter
>
>
>
> On Wed, Nov 19, 2014 at 6:48 PM, Frank Bulk <frnkblk at iname.com 
> <mailto:frnkblk at iname.com>> wrote:
>
>     Just update the relevant script to ignore those lines.
>
>     Frank
>
>     *From:* Rancid-discuss
>     [mailto:rancid-discuss-bounces at shrubbery.net
>     <mailto:rancid-discuss-bounces at shrubbery.net>] *On Behalf Of
>     *Wayne Eisenberg
>     *Sent:* Wednesday, November 19, 2014 5:09 PM
>     *To:* 'rancid-discuss at shrubbery.net
>     <mailto:rancid-discuss at shrubbery.net>'
>     *Subject:* [rancid] eliminating noise
>
>     Hey all,
>
>     Does anyone have any ideas on how we can modify rancid to ignore
>     minor differences in things like fan speed and temperature? See
>     the below:
>
>     - ! External Temperature............................. +29 C
>
>     + ! External Temperature............................. +28 C
>
>     -  ! Fan Status....................................... 3432 rpm
>
>     + ! Fan Status....................................... 3301 rpm
>
>     These two items create a lot of noise. The temperature changes by
>     1 or 2 degrees – very insignificant, but it gets caught by diff.
>     The same with the fan speed. Any character change trips the diff.
>     +/- 10% or greater is a more reasonable change to note. But I
>     don’t know how to modify the scripts to do that comparison. Any ideas?
>
>     Thanks,
>
>     Wayne
>
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